Forgive those basic questions but I am totally new to Trainz. The version I have is Trainz 2004. Can I run this game without using the CD-ROM? How can I use downloaded rolling-stock on the existing routes?
I'm assuning that you have downloaded something...
Start 2004, and use the "Surveyor" button.
Choose a layout, find where you want to put the rollingstock.
Now select what you want (use the tab option with the wheel to show the rollingstock available). Clickon the item, point to the track, click. Repeat as needed.